The PRS-900 does have a built-in dictionary. While reading a book, just double tap the word and the definition will show at the bottom of the screen. Only 2 or 3 lines will show but you can zoom into full dictionary mode if there is more information on that one word. Tapping a particular part of the screen will take you back to the book to continue reading. Selection words can be done either via stylus or fingernail.
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